7.5-minute Digital Elevation Model (10 meter resolution Grid)

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Frequently-anticipated questions:


What does this data set describe?

    Title: 7.5-minute Digital Elevation Model (10 meter resolution Grid)
    Abstract:
    USGS Digital Elevation Model (DEM) data files are digital representations of cartographic information in a raster form. DEMs consist of a sampled array of elevations for a number of ground positions at regularly spaced intervals. These digital cartographic/geographic data files are produced by the U.S. Geological Survey (USGS) as part of the National Mapping Program.

  1. How should this data set be cited?

    U.S. Geological Survey EROS Data Center, 1999, 7.5-minute Digital Elevation Model (10 meter resolution Grid): U. S. Geological Survey, Sioux Falls, SD.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -111.36
    East_Bounding_Coordinate: -104
    North_Bounding_Coordinate: 45.0
    South_Bounding_Coordinate: 41.0

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 1999
    Ending_Date: 2001
    Currentness_Reference: publication date of source maps

  5. What is the general form of this data set?

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a raster data set.

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 12
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: .09996
      Longitude_of_Central_Meridian: -111
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 0.0
      False_Northing: 0.0

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 10
      Ordinates (y-coordinates) are specified to the nearest 10
      Planar coordinates are specified in meters

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    The digital elevation model is composed of a 6- character integer raster representing a gridded form of a topographic map hypsography overlay, with a value in meters. In Wyoming, elevations range from approximately 900-4200 meters.

    Entity_and_Attribute_Detail_Citation:
    U.S.Department of the Interior, U.S. Geological Survey, 1992, Standards for digital elevation models: Reston, VA,


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Data Manager
    Spatial Data and Visualization Center
    Box 4008 University Station
    Laramie, Wyoming 82071
    USA

    307-766-2751 (voice)
    n/a

    Hours_of_Service: 8:00 - 5:00 MST


Why was the data set created?

Geospatial elevation data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping, and visualization applications.


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    Date: 2003 (process 1 of 1)
    Digital Elevation Model (10 meter resolution) were downloaded from www.MapMart.com (originating at USGS EROS Date Center) in SDTS data format in UTM, referenced to NAD 27, Clarke 1866. These data were then converted to ESRI ArcGIS GRID format using the SDTS conversion tool within ESRI ArcGIS Toolbox. The grids were then reprojected from UTM, NAD27 to UTM, NAD83. Twelve quadrangles were downloaded: Meadowville, Laketown, Sage Creek, Garden City, Bear Lake South, Sheppen Creek, Saint Charles, Bear Lake North, Pegrem Creek, Paris, Dingle, and Pegrem. The ESRI ArcGIS MERGE command was used to merged all of the reprojected grids into one composite grid. The ESRI ArcGrid command, sample, was then used to export the composite grid as an x,y,z file.

    Person who carried out this activity:

    Jane F. Denny
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    508-457-2311 (voice)
    508-457-2310 (FAX)
    jdenny@usgs.gov

  3. What similar or related data should the user be aware of?


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    not yet available

  2. How accurate are the geographic locations?

    Not available yet. Assumed to be the most accurate of all the USGS DEM products

  3. How accurate are the heights or depths?

    not available yet

  4. Where are the gaps in the data? What is missing?

    not yet available

  5. How consistent are the relationships among the observations, including topology?

    not yet available


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints: None.

  1. Who distributes the data set? (Distributor 1 of 1)

    Data Manager
    Spatial Data and Visualization Center
    Box 4008 University Station
    Laramie, Wyoming 82071
    USA

    307-766-2751 (voice)
    n/a

  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate used described in this metadata document.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 31-Aug-2000

Metadata author:
Margo Berendsen
Box 4008 University Station
Laramie, Wyoming 82071
USA

307-766-2751 (voice)
meh@uwyo.edu

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.7.17 on Wed Jul 02 14:25:50 2003